GraphThing - GraphThing is a tool that allows you to create, manipulate and study graphs.
Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
SocNetV - Social Network Visualizer (SocNetV) is a cross-platform, user-friendly free software application for social network analysis and...
Linkurious - Search and visualize your graph data through a simple web-based interface
jsflap - A web-based NFA and DFA construction and testing tool.
Maltego - Maltego is an open source intelligence and forensics application.